/**
* DECLARE_KFIFO - macro to declare a kfifo and the associated buffer
* @name: name of the declared kfifo datatype
- * @size: size of the fifo buffer
+ * @size: size of the fifo buffer. Must be a power of two.
*
* Note1: the macro can be used inside struct or union declaration
* Note2: the macro creates two objects:
*/
#define INIT_KFIFO(name) \
name = __kfifo_initializer(sizeof(name##kfifo_buffer) - \
- sizeof(struct kfifo), name##kfifo_buffer)
+ sizeof(struct kfifo), \
+ name##kfifo_buffer + sizeof(struct kfifo))
/**
* DEFINE_KFIFO - macro to define and initialize a kfifo
* @name: name of the declared kfifo datatype
- * @size: size of the fifo buffer
+ * @size: size of the fifo buffer. Must be a power of two.
*
* Note1: the macro can be used for global and local kfifo data type variables
* Note2: the macro creates two objects:
unsigned char name##kfifo_buffer[size]; \
struct kfifo name = __kfifo_initializer(size, name##kfifo_buffer)
-#undef __kfifo_initializer
-
extern void kfifo_init(struct kfifo *fifo, void *buffer,
unsigned int size);
extern __must_check int kfifo_alloc(struct kfifo *fifo, unsigned int size,
extern __must_check unsigned int kfifo_out_peek(struct kfifo *fifo,
void *to, unsigned int len, unsigned offset);
+/**
+ * kfifo_initialized - Check if kfifo is initialized.
+ * @fifo: fifo to check
+ * Return %true if FIFO is initialized, otherwise %false.
+ * Assumes the fifo was 0 before.
+ */
+static inline bool kfifo_initialized(struct kfifo *fifo)
+{
+ return fifo->buffer != NULL;
+}
/**
* kfifo_reset - removes the entire FIFO contents
* @n: the length of the data to be added.
* @lock: pointer to the spinlock to use for locking.
*
- * This function copies at most @len bytes from the @from buffer into
+ * This function copies at most @n bytes from the @from buffer into
* the FIFO depending on the free space, and returns the number of
* bytes copied.
*/
* @n: the size of the destination buffer.
* @lock: pointer to the spinlock to use for locking.
*
- * This function copies at most @len bytes from the FIFO into the
+ * This function copies at most @n bytes from the FIFO into the
* @to buffer and returns the number of copied bytes.
*/
static inline __must_check unsigned int kfifo_out_locked(struct kfifo *fifo,